Comparison

Reaction Speed Reflex Trainer vs Stackfall

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

Reaction Speed Reflex Trainer

Sharpen your reflexes and boost reaction speed with engaging game modes. Measure your reaction time to the millisecond, compete on global leaderboards, and track your progress. Ideal for improving focus, training reflexes, or simply for fun.

Highlights
  • Reaction time measurement
  • Multiple game modes
  • Global leaderboards
  • Progress tracking
  • Focus and reflex training
Features
Read full description

Boost your reaction speed and sharpen your reflexes with the ultimate Reaction Time Test app! Designed for simplicity and fun, this app puts your reaction time to the ultimate test. Tap the moment the screen changes from red to green and see your reactions measured down to the millisecond. Explore exciting game modes that challenge your reflexes and reaction skills: Classic Reaction Test: Tap the moment the screen turns green. Lights Out: Inspired by Formula 1, react to the lights turning off as quickly as possible. Chimp Test: Test your memory and reactions simultaneously in this unique challenge. Aim Game: Hit 30 targets as fast as you can to test your speed, precision, and reactions. The Hole: A fun twist that combines accuracy and reaction timing. Compete with others by climbing the reaction leaderboards and comparing scores with players worldwide. Track your reaction progress, smash your personal best, and see your reaction time improve with every game mode. Whether you’re improving focus, training reflexes, or just having fun, this app is the ultimate tool to train and test your reaction time. Download now to test, train, and dominate your reactions! EULA: https://www.apple.com/legal/internet-services/itunes/dev/stdeula/

About

Stackfall

Features
Read full description

A crane swings your next block above a wobbly tower. Tap at the right moment to drop it. Stack high enough and the little climber on your tower grabs the crate hanging above him. Every run has a goal: a crate, hanging just out of reach. Every crate has a part of something inside. Open all eight to find out what they build. - One tap: the only thing you choose is the moment - 16 crates in two chapters, and a surprise when each chapter's last one opens - Three missions always running, with progress on every run, even the ones that fall over - Party hats, specs and a moustache for your blocks, earned by playing - 19 sky sightings to spot as your tower gets taller - Plays offline, with no account and no sign-in THE MISTAKES GET HEAVIER The game never gets harder. The crane swings at the same speed on your first block and your fiftieth. Your tower just gets taller, and everything you rushed at the bottom starts to matter. Gravity keeps honest books. EVERY BLOCK IS SOMEBODY Every block is a small character with a face and a temperament. They squint, they fret, they sweat as the tower sways. Land something heavy on one and it strains. Push your luck and they go from calm to worried to outright panic. The one that finally falls gets spiral eyes on the way down. EIGHT CRATES, ONE SECRET Every crate holds one part, and nothing tells you what the parts are for. The first crate hangs at 2.5 m, the eighth at 16 m. Some bring a new block or tool with them: a wide deck to steady a wobble, a preview of the next block. Open all eight and the parts come together. Chapter two is for serious stackers: eight more crates up to 26 m, some with a block budget, some hanging off to the side. After that, the stars. MISSIONS AND HATS Three small missions are always on the go: land a block dead centre, stack a block on its twin, help the climber up a few more pegs. They count across runs, so a tower that topples still gets you somewhere. Finish a set and your blocks get something new to wear, from a party hat to a crown. SOMEBODY IS UP THERE Stack past the clouds and the sky starts noticing. A little guy on a cloud, eating mustard. A watcher who waves back, a bit more of him each time you reach him. A moon that wakes up and stares. A whale. A door, ajar, that never opens. Every one you spot is counted, and some of them are rare. Tap to drop. Help him up. Then watch it all come down.

Screenshots

Reaction Speed Reflex Trainer4 screens
Stackfall4 screens

Verdict

The call

The clearest difference is in-app purchases: Stackfall at none against Reaction Speed Reflex Trainer's 4. Stackfall also leads on update cadence (every 10 days vs every 3 months). On price, ads, device support and iOS requirement there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Both are free to download. Reaction Speed Reflex Trainer sells 4 in-app purchases, starting at $0.99 per 7 days. Stackfall asks for nothing beyond the download.

UpkeepUpdate frequency

Reaction Speed Reflex Trainer ships an update every 3 months, Stackfall every 10 days. The most recent releases landed on October 14, 2026 and October 16, 2026 respectively.

Scorecard2 real differences · 8 level
Reaction Speed Reflex Trainer versus Stackfall: the parameters behind the verdict, then further details
ParameterReaction Speed Reflex TrainerStackfall
PriceFreeFree
Rating4.6 (1.4K ratings) — better—
Positive reviews53.4% of reviews—
Number of ratings1.4K — better—
Update frequencyEvery 3 monthsEvery 10 days — better
AdsYesYes
In-app purchasesYesNo — better
MonetizationFree with in-app purchases—
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS16.615.0 — better
Further details — not scored
Size27 MB69 MB
Age rating4+4+
DeveloperVicki PartridgeDevCraft

Bugs and requests

Reaction Speed Reflex Trainer

Reported bugs

3 issues
  • Reaction time not updating correctly
  • Crashes when trying to use paid features
  • Ads continue to show even after purchasing ad-free version

Requested features

3 requests
  • Track personal best reaction time
  • Add more game modes and challenges
  • Improve ad placement and reduce interruptions

Stackfall

Not enough reviews yet to summarise bugs or requests.

In-app purchases

4 purchases

Reaction Speed Reflex Trainer

Subscriptions3
  • Weekly Subscription7 Days trial$0.997 Days
  • Monthly Subscription7 Days trial$4.991 Month
  • Yearly Subscription7 Days trial$9.991 Year
One-time1
  • Remove Ads$1.99
None

Stackfall

No in-app purchases

Questions

Is Reaction Speed Reflex Trainer free?
Reaction Speed Reflex Trainer is free to download, with in-app purchases available.
Is Stackfall free?
Stackfall is free to download, with no in-app purchases.
Do Reaction Speed Reflex Trainer or Stackfall have ads?
Both Reaction Speed Reflex Trainer and Stackfall show ads.
Which is updated more often, Reaction Speed Reflex Trainer or Stackfall?
Reaction Speed Reflex Trainer ships an update every 3 months, and Stackfall every 10 days. Most recently, Reaction Speed Reflex Trainer was updated on October 14, 2026 and Stackfall on October 16, 2026.

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